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Designing Optimal Disability Insurance

Working Paper 628 | Published January 1, 2003

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Designing Optimal Disability Insurance


In this paper we describe how to optimally design a disability insurance system. The key friction in the model is imperfectly observable disability. We solve a dynamic mechanism design problem and provide a theoretical and numerical characterization of the social optimum. We then propose a simple tax system that implements an optimal allocation as a competitive equilibrium. The tax system that we propose includes only taxes and transfers that are similar to those already present in the U.S. tax code: a savings tax and an asset-tested transfer program. Using a numerical simulation, we compare our optimal disability system to the current disability system. Our results suggest a significant welfare gain from switching to an optimal system.

Published as "Designing Optimal Disability Insurance: A Case for Asset Testing" in _Journal of Political Economy_ (Vol. 114, Iss. 2, April 2006, pp. 257-279),